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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-06-18 23:36:23 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-06-18 23:36:23 +0200
commit9864ea5b2045f4bd72633152d71dd1c7f8b0b7f9 (patch)
tree1dd2201331ed86ab62740ab8545ae324032c3f69 /lib/fstree
parenta5d7779a30d74205c92c5bb1968855e7e61d4458 (diff)
Cleanup fstree file parser
- use generic struct stat based tree node add function - simplify some of the parsing code Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'lib/fstree')
-rw-r--r--lib/fstree/fstree_from_file.c206
1 files changed, 51 insertions, 155 deletions
diff --git a/lib/fstree/fstree_from_file.c b/lib/fstree/fstree_from_file.c
index affa769..ded404a 100644
--- a/lib/fstree/fstree_from_file.c
+++ b/lib/fstree/fstree_from_file.c
@@ -12,17 +12,11 @@
#include <ctype.h>
#include <errno.h>
-static int add_dir(fstree_t *fs, const char *filename, size_t line_num,
- const char *path, uint16_t mode, uint32_t uid,
- uint32_t gid, const char *extra)
+static int add_generic(fstree_t *fs, const char *filename, size_t line_num,
+ const char *path, struct stat *sb, const char *extra)
{
- if (extra != NULL && *extra != '\0') {
- fprintf(stderr, "%s: %zu: WARNING: ignoring extra arguments\n",
- filename, line_num);
- }
-
- if (fstree_add(fs, path, S_IFDIR | mode, uid, gid, 0) == NULL) {
- fprintf(stderr, "%s: %zu: mkdir -p %s: %s\n",
+ if (fstree_add_generic(fs, path, sb, extra) == NULL) {
+ fprintf(stderr, "%s: %zu: %s: %s\n",
filename, line_num, path, strerror(errno));
return -1;
}
@@ -30,141 +24,35 @@ static int add_dir(fstree_t *fs, const char *filename, size_t line_num,
return 0;
}
-static int add_slink(fstree_t *fs, const char *filename, size_t line_num,
- const char *path, uint16_t mode, uint32_t uid,
- uint32_t gid, const char *extra)
-{
- tree_node_t *node;
- (void)mode;
-
- if (extra == NULL || *extra == '\0') {
- fprintf(stderr, "%s: %zu: missing symlink target\n",
- filename, line_num);
- return -1;
- }
-
- node = fstree_add(fs, path, S_IFLNK | 0777, uid, gid,
- strlen(extra) + 1);
-
- if (node == NULL) {
- fprintf(stderr, "%s: %zu: ln -s %s %s\n",
- filename, line_num, extra, path);
- return -1;
- }
-
- strcpy(node->data.slink_target, extra);
- return 0;
-}
-
static int add_device(fstree_t *fs, const char *filename, size_t line_num,
- const char *path, uint16_t mode, uint32_t uid,
- uint32_t gid, const char *extra)
+ const char *path, struct stat *sb, const char *extra)
{
- unsigned int maj = 0, min = 0;
- tree_node_t *node;
+ unsigned int maj, min;
+ char c;
- if (extra == NULL || *extra == '\0') {
- fprintf(stderr, "%s: %zu: missing device type\n",
+ if (sscanf(extra, "%c %u:%u", &c, &maj, &min) != 3) {
+ fprintf(stderr, "%s: %zu: expected '<c|b> major:minor'\n",
filename, line_num);
return -1;
}
- if ((*extra == 'c' || *extra == 'C') && isspace(extra[1])) {
- mode |= S_IFCHR;
- } else if ((*extra == 'b' || *extra == 'B') && isspace(extra[1])) {
- mode |= S_IFBLK;
+ if (c == 'c' || c == 'C') {
+ sb->st_mode |= S_IFCHR;
+ } else if (c == 'b' || c == 'B') {
+ sb->st_mode |= S_IFBLK;
} else {
- fprintf(stderr, "%s: %zu: unsupported device type",
- filename, line_num);
- return -1;
- }
-
- ++extra;
- while (isspace(*extra))
- ++extra;
-
- if (!isdigit(*extra))
- goto fail_devno;
-
- while (isdigit(*extra))
- maj = maj * 10 + *(extra++) - '0';
-
- if (!isspace(*extra))
- goto fail_devno;
- while (isspace(*extra))
- ++extra;
-
- if (!isdigit(*extra))
- goto fail_devno;
-
- while (isdigit(*extra))
- min = min * 10 + *(extra++) - '0';
-
- while (isspace(*extra))
- ++extra;
-
- if (*extra != '\0') {
- fprintf(stderr, "%s: %zu: WARNING: ignoring extra arguments\n",
- filename, line_num);
- }
-
- node = fstree_add(fs, path, mode, uid, gid, 0);
- if (node == NULL) {
- fprintf(stderr, "%s: %zu: mknod %s %c %u %u: %s\n",
- filename, line_num, path, S_ISCHR(mode) ? 'c' : 'b',
- maj, min, strerror(errno));
+ fprintf(stderr, "%s: %zu: unknown device type '%c'\n",
+ filename, line_num, c);
return -1;
}
- node->data.devno = makedev(maj, min);
- return 0;
-fail_devno:
- fprintf(stderr, "%s: %zu: error in device number format\n",
- filename, line_num);
- return -1;
-}
-
-static int add_pipe(fstree_t *fs, const char *filename, size_t line_num,
- const char *path, uint16_t mode, uint32_t uid,
- uint32_t gid, const char *extra)
-{
- if (extra != NULL && *extra != '\0') {
- fprintf(stderr, "%s: %zu: WARNING: ignoring extra arguments\n",
- filename, line_num);
- }
-
- if (fstree_add(fs, path, S_IFIFO | mode, uid, gid, 0) == NULL) {
- fprintf(stderr, "%s: %zu: mkfifo %s: %s\n",
- filename, line_num, path, strerror(errno));
- return -1;
- }
-
- return 0;
-}
-
-static int add_socket(fstree_t *fs, const char *filename, size_t line_num,
- const char *path, uint16_t mode, uint32_t uid,
- uint32_t gid, const char *extra)
-{
- if (extra != NULL && *extra != '\0') {
- fprintf(stderr, "%s: %zu: WARNING: ignoring extra arguments\n",
- filename, line_num);
- }
-
- if (fstree_add(fs, path, S_IFSOCK | mode, uid, gid, 0) == NULL) {
- fprintf(stderr, "%s: %zu: creating Unix socket %s: %s\n",
- filename, line_num, path, strerror(errno));
- return -1;
- }
-
- return 0;
+ sb->st_rdev = makedev(maj, min);
+ return add_generic(fs, filename, line_num, path, sb, NULL);
}
static int add_file(fstree_t *fs, const char *filename, size_t line_num,
- const char *path, uint16_t mode, uint32_t uid,
- uint32_t gid, const char *extra)
+ const char *path, struct stat *basic, const char *extra)
{
- tree_node_t *node;
struct stat sb;
if (extra == NULL || *extra == '\0')
@@ -176,29 +64,26 @@ static int add_file(fstree_t *fs, const char *filename, size_t line_num,
return -1;
}
- node = fstree_add_file(fs, path, mode, uid, gid, sb.st_size, extra);
+ sb.st_uid = basic->st_uid;
+ sb.st_gid = basic->st_gid;
+ sb.st_mode = basic->st_mode;
- if (node == NULL) {
- fprintf(stderr, "%s: %zu: adding %s as %s: %s\n",
- filename, line_num, extra, path, strerror(errno));
- return -1;
- }
-
- return 0;
+ return add_generic(fs, filename, line_num, path, &sb, extra);
}
static const struct {
const char *keyword;
+ unsigned int mode;
+ bool need_extra;
int (*callback)(fstree_t *fs, const char *filename, size_t line_num,
- const char *path, uint16_t mode, uint32_t uid,
- uint32_t gid, const char *extra);
+ const char *path, struct stat *sb, const char *extra);
} file_list_hooks[] = {
- { "dir", add_dir },
- { "slink", add_slink },
- { "nod", add_device },
- { "pipe", add_pipe },
- { "sock", add_socket },
- { "file", add_file },
+ { "dir", S_IFDIR, false, add_generic },
+ { "slink", S_IFLNK, true, add_generic },
+ { "nod", 0, true, add_device },
+ { "pipe", S_IFIFO, false, add_generic },
+ { "sock", S_IFSOCK, false, add_generic },
+ { "file", S_IFREG, false, add_file },
};
#define NUM_HOOKS (sizeof(file_list_hooks) / sizeof(file_list_hooks[0]))
@@ -229,10 +114,13 @@ static int handle_line(fstree_t *fs, const char *filename,
size_t line_num, char *line)
{
const char *extra = NULL, *msg = NULL;
- unsigned int mode = 0, uid = 0, gid = 0, x;
char keyword[16], *path;
+ unsigned int x;
+ struct stat sb;
size_t i;
+ memset(&sb, 0, sizeof(sb));
+
/* isolate keyword */
for (i = 0; isalpha(line[i]); ++i)
;
@@ -274,9 +162,9 @@ static int handle_line(fstree_t *fs, const char *filename,
if (line[i] > '7')
goto fail_mode;
- mode = (mode << 3) | (line[i] - '0');
+ sb.st_mode = (sb.st_mode << 3) | (line[i] - '0');
- if (mode > 07777)
+ if (sb.st_mode > 07777)
goto fail_mode_bits;
}
@@ -293,10 +181,10 @@ static int handle_line(fstree_t *fs, const char *filename,
for (; isdigit(line[i]); ++i) {
x = line[i] - '0';
- if (uid > (0xFFFFFFFF - x) / 10)
+ if (sb.st_uid > (0xFFFFFFFF - x) / 10)
goto fail_ov;
- uid = uid * 10 + x;
+ sb.st_uid = sb.st_uid * 10 + x;
}
if (!isspace(line[i]))
@@ -312,10 +200,10 @@ static int handle_line(fstree_t *fs, const char *filename,
for (; isdigit(line[i]); ++i) {
x = line[i] - '0';
- if (gid > (0xFFFFFFFF - x) / 10)
+ if (sb.st_gid > (0xFFFFFFFF - x) / 10)
goto fail_ov;
- gid = gid * 10 + x;
+ sb.st_gid = sb.st_gid * 10 + x;
}
/* extra */
@@ -330,16 +218,24 @@ static int handle_line(fstree_t *fs, const char *filename,
/* forward to callback */
for (i = 0; i < NUM_HOOKS; ++i) {
if (strcmp(file_list_hooks[i].keyword, keyword) == 0) {
+ if (file_list_hooks[i].need_extra && extra == NULL)
+ goto fail_no_extra;
+
+ sb.st_mode |= file_list_hooks[i].mode;
+
return file_list_hooks[i].callback(fs, filename,
line_num, path,
- mode, uid, gid,
- extra);
+ &sb, extra);
}
}
fprintf(stderr, "%s: %zu: unknown entry type '%s'.\n", filename,
line_num, keyword);
return -1;
+fail_no_extra:
+ fprintf(stderr, "%s: %zu: missing argument for %s.\n",
+ filename, line_num, keyword);
+ return -1;
fail_ov:
msg = "numeric overflow";
goto fail_ent;